Ultrafast optical excitation of a combined coherent-squeezed phonon field in SrTiO_3

Open Access

8 December 1997

journal article
Published by Optica Publishing Group in Optics Express

Vol. 1 (12) , 385-389
https://doi.org/10.1364/oe.1.000385

Abstract

We have simultaneously excited a coherent and a squeezed phonon field in SrTiO₃ using femtosecond laser pulses and stimulated Raman scattering. The frequency of the coherent state (~ 1.3 THz) is that of the A _1g-component of the soft mode responsible for the cubic-tetragonal phase transformation at ≈ 110 K. The squeezed field involves a continuum of transverse acoustic phonons dominated by a narrow peak in the density of states at ~ 6.9 THz.

Keywords

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